FreeLists / si-list / [SI-LIST] Re: How to Measure Ground Noise

["Jim Antonellis" <janton@xxxxxxxxxxxxx>]

Hi pyng,

From what I can picture together from your description, I believe
you are probably measuring magnetic fields, or flux that penetrate
the loop you have created, especially if you are using a high imp
probe.

I'm not sure what you mean by ground noise or what type of probe
you are using, but if you are looking for voltage deviations from
a certain DC potential the probe is looking for a potential difference
and it will not see any with the probes touching the same TP.

If you want to email me offline we can continue to discuss this...

Regards,
Jim

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Jim Antonellis   janton@xxxxxxxxxxxxx
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-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx
[mailto:si-list-bounce@xxxxxxxxxxxxx]On Behalf Of ospyng
Sent: Wednesday, April 06, 2005 2:23 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] How to Measure Ground Noise



hi,
I was taught to measure ground noise, by having the ground of the
probe connect to ground TP of the board and the tip of the probe
measuring the same TP.

is this the correct where? and Why? 
is it because of the ground cable (3 inch) cause a loop, therefore the
reference and the tip of the probe has a different voltage?

thanks
pyng



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